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D
X
P
N
-
U
D
X
P
N
-
U
E
E
C
C
C
C
(
(
E
E
r
r
r
r
o
o
r
r
C
C
h
h
e
e
c
c
k
k
i
i
n
n
g
g
a
a
n
n
d
d
C
C
The ECC mode needs 8 ECC bits for 64-bit data. Each time memory is accessed; ECC bits are updated and checked by a
special algorithm. The ECC algorithm has the ability to detect double-bit error and automatically correct single-bit error while
parity mode can only detect single-bit error.
E
E
E
E
P
P
R
R
O
O
M
M
(
(
E
E
l
l
e
e
c
c
t
t
r
r
o
o
n
n
i
i
c
c
E
E
r
r
a
a
s
s
a
a
2
Also known as E
PROM. Both EEPROM and
technology is different. Size of EEPROM is much smaller than flash ROM.
E
P
R
O
M
(
E
r
a
s
a
b
l
e
P
r
o
g
r
a
m
E
P
R
O
M
(
E
r
a
s
a
b
l
e
P
r
o
g
r
a
m
Traditional motherboard stores BIOS code in EPROM. EPROM can only be erased by ultra-violet (UV) light. If BIOS has to be
upgraded, you need to remove EPROM from motherboard, clear by UV light, re-program, and then insert back.
E
V
6
B
u
s
E
V
6
B
u
s
EV6 Bus is the technology of Alpha processor from Digital Equipment Corporation. EV6 bus uses both rising and falling clock
edge to transfer data, similar as DDR RAM or ATA/66 IDE bus.
EV6 Bus Speed = CPU external bus clock x 2.
200 MHz EV6 bus, 200MHz = 100 MHz external bus clock x 2
o
o
r
r
r
r
e
e
c
c
t
t
i
i
o
o
n
n
)
)
b
b
l
l
e
e
P
P
r
r
o
o
g
g
r
r
a
a
m
m
m
m
a
a
b
b
l
l
e
e
R
R
O
O
M
M
)
)
Flash ROM
m
a
b
l
e
R
O
M
)
m
a
b
l
e
R
O
M
)
can be re-programmed by electronic signals, but the interface
92
O
n
l
i
n
e
M
a
n
u
a
l
O
n
l
i
n
e
M
a
n
u
a
l
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